Industrial production usually said feed means compound feed (including concentrate supplement feed), concentrated feed and additives. Feed, feed ingredients and feed additives in the production of feed mills have been far beyond the range of production, involving many sectors of food, food, light industry, chemicals, pharmaceuticals, mining, etc., so the feed industrial production engineering process used and equipment mostly from these departments. In the production process of feed, feed ingredients and feed additives are applied to varying degrees, drying technology, that is drying technology widely used in the feed industry. First, the raw material feed production feed mills in the production, use, such as corn, soybean meal, fish meal and other raw materials, and some due to improper storage, rain or moisture and so it too much water, or the procurement of raw materials into the plant When it excessive moisture. Therefore, when feed or concentrated feed production, often the raw material is dried, such as a tower dryer, air dryer or vibration fluidized bed dryer and the like. When the main raw material used in the production of premix, feed additive belongs to light industry, chemical industry, pharmaceutical sector product, which contains moisture is low; except in special circumstances, generally in feed mills no longer be dried; the main pre- When mixing used in the production of carrier or diluent, such as powder, bran, corn flour or corn cob powder, its high moisture content, the need to use air dryer, fluidized bed dryer, drum dryer for drying, etc. . When the particle-containing feed production, just out from the pellet mill feed pellets at a temperature of around 80 ℃, the moisture content of about 17%, hence the need for ventilation and cooling, cooling water removal, the temperature dropped to close to room temperature (slightly higher than room temperature) , reduced to below 13% moisture. Feed after drying for storage, easy to mold. Second, feed raw materials to produce our country because food production is limited, a raw material used in feed production far beyond corn, soybean meal (cake), fish meal and other conventional feed ingredients. Many industrial and agricultural production of byproducts after processing have become a valuable feed materials such as: leather tannery waste processing protein powder, slaughter plant waste processing bone meal, bone meal, intestinal feather meal, feather meal, blood meal, alcohol plant waste processing DDGS (dried distillers whole) or DDG, breweries and waste production of forage lees lees, beer yeast feed, and forage processed into meal, grass grains, grass and other pieces. In the production of feed ingredients, particularly the use of industrial and agricultural production of plants and animals by-products or waste (waste water, sludge) production (recovery) of feed ingredients, most of the material must be dried. In terms of animal and plant feed resource recovery, despite the different properties of various materials, but the process may generally include ① material pretreatment. ② sterilization, decomposition. ③ dehydration, degreasing, concentrated, liquid-solid separation. ④ dry. ⑤ grinding, packaging. For any particular product from the above generally applicable process, select the appropriate number of unit operations which consists of a complete process of such suitable raw materials or products. In the material moisture removal operation, drying operation is one of the highest energy consumption, but also feed resources development and utilization of the most important unit operations, it is to control the quality of products, one of the main factors of production cost and production efficiency, drying and a lot of equipment, and only in accordance with the requirements of the physical properties of materials and products, the choice of suitable drying methods and equipment, only obtain high returns. (1) waste dander tanneries treated alkaline hydrolysis, etc., using a spray dryer or a vacuum dryer production of leather protein powder. (2) animal blood after slaughtering plants processed by spray drying to produce high-protein feed ingredient blood meal. (3) abattoir pigs, chickens, ducks, cattle bones, meat, hoofs, horns and intestines, feathers, blood and other waste, after melting (cooking) process, can produce bone meal, bone meal, feather depending on the starting situation pink, pink feather intestines, intestinal plume mixing of blood protein feed and other feed ingredients, the production process and some use of smelting (cooking) drying, a process completed; some use one of smelting (cooking), dried (material moisture, viscosity large) and two dry process air drying combined treatment. (4) Corn flour mill effluent (yellow pulp) usually after mechanical dewatering by an air-drying production of corn gluten meal. (5) Alcohol factory in the production of corn-based ethanol, which is the waste using mechanical dewatering (Decanter centrifuge or filter presses) and then use the disk dryer or dryer tubes to obtain DDG protein feed or the mechanical separation of the soluble components of the waste by the multi-effect evaporator (usually 4 to 6) After the mixture was concentrated and dried with mechanical dewatering resulting solid was obtained after DDGS protein feed. (6) The brewery and liquor factory of solid lees after pretreatment, using a fluidized bed or air drying, the product can be used for feed ingredients. After the brewery yeast waste drum drier feed can be produced beer yeast, high-quality protein feed ingredients. (7) cottonseed meal, rapeseed meal and other oilseed meal containing toxins when using the chemical method, when the detoxification process of fermentation or thermal spray method, the process generally required to use a drying operation, such as: air drying, spouted bed drying, fluidized bed drying. Third, dried pasture forage according to its different purposes, some of the forage dry and ventilated directly, some of the pasture use thermal drying reduce the moisture fast meal, grain and grass grass block. (1) ventilated and dry pasture forage stored within a simple structure silo to the main ventilation (cold or low-temperature heating air) dried grass, the so-called air drying or storage dry. Some use a cylindrical tower positions, through a forced air or hot air drying forage. (2) thermal drying forage according to production needs, in order to speed up the forage drying using high temperature air drying, usually divided into continuous and intermittent to fuel heated air to achieve rapid drying pasture. Continuous operation conveyor type drying equipment, air pipeline, air drum and the like. Fourth, trace elements and bacitracin zinc (1) trace minerals are important additives for animal feed, and some production process need to be dried product, especially sulfate products, such as: CuSO 4 · 5H 2 O, FeSO 4 · 7H 2 O, ZnSO 4 · 7H 2 O, etc. due to containing five or seven crystal water, high moisture absorption, hygroscopic, caking, when feed processing is easy to use, and often its pre-treatment: As the sulfate (agglomeration) after breaking into the drum drier material and hot air for downstream heat exchanger to complete the drying. (2) Bacitracin Zinc is used in the production of feed more of a medicated feed additive. Its production process in the fermentation broth of bacitracin and Zn 2 + ions into a salt, the enhanced stability makes bacitracin, obtained by spray-drying a final product. Fifth, the production of feed additives Vitamin A Vitamin A is essential for growth of animal vitamin, feed products is therefore an important nutritional additives. Because vitamin A is a fat-soluble vitamin, can not be directly dissolved in water and diluted in air encounter oxygen and light will it be destroyed, it must be made of vitamins A and air separation ability and good mobility powder easily added to the feed. Powder preparation commonly used industrial complex coacervation microcapsules and spray granulation processes. Spray granulation process is an emulsion of vitamin A oil and an aqueous solution of gelatin made of oil in water, the system is made by spraying droplets of the starch in the suspension after encountering cold air, the coated starch microparticles formed; the entire spray granulation VA wet granules formed engineering is fed continuously to the fluid bed dryer for drying. In addition to vitamin A, a lot of types of feed additive, has been published allowed nutritional feed additives and feed additives in general, such as: amino acids, vitamins, minerals, enzymes, antioxidants, preservatives and the like there are 191 kinds, is protected the period of nine species; commercial feed allows the use of 33 kinds of medicated feed additives. These additives in the production process, many products are inseparable from the drying process. VI Summary In summary, we can see from the example feed industry specific applications drying technology, many aspects of the feed industry should be applied drying techniques. In the feed process, regardless of feed, concentrated feed and pre-mixed feed, its products or raw materials and vehicle treatment, due to their particular products or raw materials, such as using different drying process. Drying of feed industrial production processes essential component. With the continuous development of feed industry, the industry will be more and more involved in new product development and out, drying process and equipment in its production process applied more widely. 

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